It’s been barely a year since we first got look at the innovative Audi eTron, one of the first in a wave of new battery-powered supercar concepts that have been charging out on the auto show circuit.

But the big difference between the original Audi eTron and the eTron Spyder debuting at the 2010 Paris Motor Show really isn’t the lack of a roof, it turns out. The latest take on this battery sports car concept introduces an alternative way to power its wheels.

Charge Ahead!

Where the original eTron relied purely on lithium-ion batteries, much like a Nissan Leaf on major league steroids, the eTron Spyder opts for a plug-in hybrid powertrain, and one that adopts a novel through-the-road approach to all-wheel-drive.